Try soaking the valve in some warm water first, that can loosen things up. If that doesn't work, a tiny drop of penetrating oil on the valve stem might do the trick, just let it sit for a while. Honestly, those old Colemans are built like tanks and worth fixing if you can. I've brought a few back from the dead just by taking them apart and cleaning all the old gunk out. The parts are usually simple and you can find rebuild kits online pretty cheap. Way better than tossing a perfectly good stove that just needs a little love.

Honestly that sounds familiar. Tbh I usually just give up after a few searches and accept the memory loss.

Actually, everyone's missing the key point about pressure. The finishers were probably just relieved it was over. That final job is a huge weight off their shoulders.

Chilling helps with the butter, not just the gluten.